Compilare: user.c: In function ‘main’: user.c:9: warning: format ‘%d’ expects type ‘int *’, but argument 2 has type ‘long int *’ user.c:20: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long int’ user.c:4: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:5: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:9: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result